Extension-plug for electric lights.



B. I). LGRTGN,

EXTENSION PLU'U FOR ELEUTR PATENTED FEB! 18, 1903,

APPLIOATION FILED OGT.2, 1903. RENEWED JAN. 12, 1906 A: minim BRYSON DEXTER source, or nnrnoir, MICHIGAN, ASSIGNOR TO sniii'iinu ntncrnro MANUFACTURING COMPANY, OF CHICAGO, ILLINOI S, A CORPORATION OF ILLINOIS.

ET'TENSZZOBLL LUG ELECTRIC LIZGHTS Application filed Gctobor at Detroit, county or Wayne, State of Michiplug coupling which can tionel ViQW showing the plug gen, have invented a certain new and useful I?" o t, F -n I 1 'l'r1 b a .nipiovcnicn n1 distension. lugs .01 .i-ec tri L 'ht and (3 l h 5 ll l \1 c, J; BQwlL t e o onnig to re a tuil, clear and exact description oi the same, such as will enable others'slqlled in the art to which it pertains to make and use the same, reterence being had to the accompanying d.l'&\V1HgS,W'iliCll term a part of this specilocation.

This invention relates to extension couplings for conductors of electric currents from the ordinary Edison lamp socket, and has for its object the provision of an improved be quickly inserted and withdrawn from "he socket without twisting the pair, of conducting cords which are attachedto it, and which are use'd to conduct current from the socket to its place of use,

In the drawingsz l igure 1, is a perspective View of the plug. Fig. :2, is a cross secinserted into an ordinary socket. Fig. 3, is a detail section of one oi the contacts used in connection with the plug.

A indicates an ordinary Edison socket providedwrith the screw threaded sleeve 1, lnto which the screw threaded sleeve of the light bulb is commonly screwed, provided also with the contact spring 2, manipulated by the thumb lover 3, in the ordinary way. The plug which embodies tnis invention is provided with a body part i that hollow, and through which extends axially a movable pin 5 normally held with the end 5, projecting Drum-the body under the force of a spring (5, that is inserted in the bore of the body between the collar 7 on the pin and an abutment 8 within the bore.

A portion of the pin above the collar 7, is coned with the large endof the cone toward the projecting" end 5 of the pin. On the outside oi'tho body are arranged arms 9 and 10, being secured at one end to that end of "the body l which is the most distant from linger 14,

Sgiecification of Letters Patent Z, 1963. Serial No. 1'i6.4l69- Renewed January 12. 19061 eerie Ho. 2535684.

Ii atented Feb. 18,1908:

pin 5, is connected electrically with the other 12, of said electric conductors. erable connection The pref pin 5 and between too the conductor 12 is by means of a short piece of flexible strand of copper Wire. Each oi the arms 9 of which there may be several, and there are preterably as many three,

is madeof resilient metal, preferably phos-- ph'or bronze or some metal which is czipablc, of maintaining resiliency which will throw the arms toward the cone shaped pin forced out by spring 6. Each oi these arms 9 is provided with a erminated with an insulating the center of body when substance and extending through a hole in the body 4, which cXtends at rightangles or substantially at rightangles to the longitudinal bore through the body part 4.

lingers 1-1.:11'0 on which. are otherw The of the arms 9 and the ends 'ise tree to vibrate,

each of the arms 9 is prcderubly terminated with a corrugated part that constitutes a partof a mutilated screw.

There may be a single screw terminated arm or several.

The extension plug is used by inserting it in thesocltet and pushing it torcihly inward with the pro ecting end oi bearing against the contact the soc hot.

i the pin 5 terminal I), in

ll'hen the coupling is pushed into the socket, the pin 5 is LlI'LHIl backward into tne body of the plug and the conical part within against the hngrers H and 05 tenninnlsfl), l0, ioreing the corthe plug bears spreads the rugated parts ot the threads of the socket.

the mutilated screw into A slight turn,

which may be less than .one quarter of a turn will cause t spread the mutilated screw,

device firmly in t1 electrlc contact with the positive [1, and with the arms electrical contact and thus making tions for the'two The arms 9, 10, etc.,

he cone of ihe pin 5 to arms-9 and it) which. form the suliiciently to secure the re socket with the pin .5 in terminal 9 and 10 inpositive 90 with the socket threads, suitable electric conneeconductors.

cannot under any brought into contact with 106 art of the socket which connects electerrninal b, and therecan hort circunmg i. coupling 'ljhe coupling is ellected it provides-a sliding contact each time the pressed pin connected to the other of the pair of conductors and operated by the in- I with a socket having a center contact and a Without twisting the cords of the extension i coupling, or the fixed cord which supports the socket A, as no more than a quarter turn of one with respect to the other is ever requisite.

An advantage of this construction is that plug is inserted. v

l/Vhat I claim is 2-- 1. An extension coupling for electric conductors, having in combination a body part, a reciprocatory coned pin, electrically connected to one of a pair ofextension conductors, a corrugated arm secured. to the body and electrically connected to the other of the pair of conductors and adapted to engage in the screw threads of a socket and provided with a finger engaging the cone of said pin and adapted to be actuated thereby, SUbStaIh tially as described.

2. An extension coupling for threaded electric lamp sockets, said coupling having in combination a body part, a corrugated arm secured to the body part and electric allyconnected to one of a pair of conductors and adapted to engage the threads of said socket, a reciprocating outwardly-springsertion of the coupling in the-socket, and means actuated. by said pin ti cause said corrugated arm to engagethe screw threads of the socket. 3. Anextension coupling for cooperation with a screw-threaded electric socket, said coupling having in combination a body part, a reciprocatory pin electrically connected to one of a pair of extension conductors, a corrugated arm secured to the body and electrically connected to theother of the pair of conductors, and arranged toengage. the screw threads of-the socket, and pro vided with a finger-engaged by said in to cause said arm to engage the screw t 'ireads of the socket.

4. An extension coupling for. cooperation with a socket having a center contact and a side contact, sai l coupling having a plug portion provided. with a central here, an outwardly-spring-pre ssed center contact mem ber disposed in said. bore, a laterallyinov able side contact tending to move toward said plug portion, and means, operated by the inward movement of said center contact n-icinber, for moving said side contact away from said plugportion and into engagement with said outer contact of said socket.

5. An extension coupling for cooperation side contact disposed in planes at right angles with each other, said coupling having a body portion, a conducting pin slidably arranged within said body portion and tending to move outward with respect thereto. a

erawe movable side contact carried by said body portion, and means whereby said side contact is shifted laterally into engagement with the side contact of. the socket when said pin engages said center contact of said. socket and contact causes outward movement of said outer contact.

7. An extension coupling for cooperation with a lamp socket having a threaded outer contact, said coupling having a laterally-- movable corrugated contact and a longitudinally movable center contact,.and operative connection between. said center and.

outer contacts, whereby inward movement of said 'centercontact causes said outer contact to move laterally.

8. An extensioncoupling for cooperation with a lamp-receiving socket having a center contact and a ring contact, said coupling comprising"an insulating plug having a central bore, a center contact member 'slid ably arranged in said bore, means tending to thrust said center member forward and outward, a laterally-movable contact tending to move toward said plug, and means, operated by the rearward movement of said center contact member, for moving said laterally' movable contact away from said plug and into engagement with the ring contact of'said socket.

9. An extension coupling for cooperation with a lamp-receiving socket having a center contact and-a ring c'ontact,'said coupling comprising an insulating body portion, a longitudinally-movable center contact, a laterally movable side contact, and means, ope1- ated by rearward and inward movement of said center contact, for moving said laterally-movable contact into engagement with said'ring contact of said socket.-

with'a socket having a center contact and an outer'contact, of a plug portion having a central bore, a center contact member arranged in said bore and pro'ecting therefrom and yieldable inwardly, a ateralljly-movable side contact, and. operative connection between said center contact and said side con-' tact, whereby whensaid center contact is moved inwardly, lateral movement is imparted to said side contact.

11. in an extension coupling, thecombination of an insulating plug, a pluralityof contact-str'ps extending longitudinally and exter'iorly of said plug and tending to move toward said plug, aspxing-pressed spindle extending longitudinally through said plug and forn'iing the center contact of sti l plug, and operative connection between said contact strips and said spindle so arranged that inward movement of said spindle Will cause I said contact strips to move away from said 1 ph e- I n testimony whereof, I, Sign this. SPPLlllfzltion in the presence of two witnesses. v

BRYSON DEXTER HORTON.

; Witnesses: l

Gimmes F. BURTON, l\'lAY E. KOTT. 

